Is not working. I MUST add it to a JPanel because I am using tabs. This is getting really frustrating.I hace not found a way yet
As ButtonGroup is not a component, you cannot add your ButtonGroup to a JPanel. Instead add your buttons to your JPanel, e.g:
JPanel jPanel = new JPanel(); ButtonGroup group = new ButtonGroup(); btn1 = new JRadioButton("btn1 ");btn1.setSelected(true); btn2 = new JRadioButton("btn2 "); group.add(btn1 ); group.add(btn2 ); jPanel.add(btn1); jPanel.add(btn2).
Hope it will be useful.